BAO, f_sigma8 and other measurements at single redshifts, with correlations AL/JH Oct 2012: encorporate DR9 data into something close to new cosmomc format Dec 2013: merged in DR11 patch (Antonio J. Cuesta, for the BOSS collaboration) Sept 2014: refactored structure using new "bao_dataset[NAME] = file.dataset" syntax added refactoed DR7 MGS code (thanks Lado Samushia) Jan 2014 added bao_HZ_rs, f_sigma8, F_AP, and more general .dat format